Which to use
“alum” is a noun and “Alun” is a name - they look or sound alike but fill different roles in a sentence.
- #20,832
- “alum” frequency rank
- #47,459
- “Alun” frequency rank
- 68291
- confusion score
Side-by-Side Comparison
| Feature | alum | Alun |
|---|---|---|
| Definition | An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K₂SO₄·Al₂(SO₄)₃·24H₂O). | A male given name from Welsh. |
Letter map: alum vs Alun
Shared letters muted; letters that set alum and Alun apart highlighted. Shared run: 3. alum and Alun follow the identical consonant-vowel pattern (VCVC). Same shape at a glance is often the real trap, independent of shared letters.
Role in the sentence - alum and Alun
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: alum is anoun and Alunaname. On the page they differ by a single letter - m in “alum” becomes n in “Alun”. Our composite confusion score for this pair is 68291, derived from the frequency rank of both members and their visual similarity.
alum is recorded at frequency rank #20,832, classified as anoun, pronounced /ˈæl.əm/. Alun is at rank #47,459, tagged as aname.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 68291, this pair ranks #59,551 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of alum vs Alun
Shared letters: alu. Private to "alum": m. Private to "Alun": n.
"alum" · 4 letters · shape VCVC · "Alun" · 4 letters · shape VCVC
Known mistypes of this pair
Frequently Asked Questions
Can "alum" and "Alun" be used interchangeably?
Frequency check: "alum" vs "Alun" - which ranks higher?
Useful next steps
Pair "alum" vs "Alun" is on the table, pick a follow-up below.
- Full dictionary entry for "alum" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "Alun" - compare definitions side by side with the headword page. Word entry
- This pair ranks #59,551 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "alum" and "Alun" also get mixed up with nearby pairs, the highest-scored neighbour is "algo vs Alun". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #59,551 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.